Question about 2004 Volkswagen Passat 1.8
The Oil Pressure light keeps coming on
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Posted on Jan 02, 2017
SOURCE: Brake Problem on 2004 VW Passat
You have to get CV Boots replaced, this happens because they split. What happen was something got stuck inside the axel where the little boots is held on and split that little piece of rubber (its easy to do). As a result, fluid leaks and and spashes on the back tires so you never know it happens. When you make turns the car will make a clicking noise. You can add fluid but, it will continue to leak out if those boots are split so, you have to replace the boots. I had to replace the boots and axel because the boots come on the axel. Its an expensive project. Boots, axel and labor $500 starting if you go through the dealer. Also, if you have an extended warranty they won't cover it because there is no time frame when these boots split it just something that can happen. Honestly, they know this is something common especially if you drive through snow.
Posted on Feb 05, 2009
This is probably a head gasket problem and not an oil cooler problem.
The oil cooler is fairly easy to test.
Remove the cooler from the engine but do not disconnect cooling lines and then pressurize the cooling system. You can use a radiator test tool to put pressure on the cooling system and look for leaks. If it leaks, replace it.
You may also be able to bypass the oil cooler altogether if it leaks.
The head gasket is another story.
Get a 1/4" pipe to spark plug fitting and put a male air coupling fitting in it.
Then you can charge the cylinders with air from your compressor.
Make sure each cylinder that you test is at top dead center so that the valves are closed.
If air bubbles into your coolant, you found your problem.
If air leaks out your intake you have a bad intake valve
If air leaks out your exhaust you have a bad exhaust valve etc.
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Posted on Apr 15, 2009
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